Subtraction: remember a large number, such as 6-3= remember 6, and then count to 3, 5, 4, 3. Then your result is 6-3=3.
Parents need to add and subtract 30- 10 with their babies every day to improve their arithmetic ability. Be careful not to let children count their fingers, develop habits that are not easy to change, and cultivate their mental arithmetic ability. You can also dial this number at the counter. Parents count their children and dial. Clamp and say the composition of these numbers. For example, 12 consists of a ten and two ones.
You can use decomposition skills to teach children from the beginning of decomposition and combination. At the same time, it can be expressed in words. You must say it with your mouth. The child who can speak out means that he has really mastered it. Start with less than 5. Let's talk about decomposition 2 first. Remember to put them together after each separation.
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Arithmetic is very complicated. If children are taught difficult arithmetic, they will have a hard time accepting it. Parents can integrate arithmetic into their children's lives. For example, go to the supermarket to buy apples, let the children choose and count for themselves. After returning home, parents can ask their children to wash two apples and eat one, and then ask their children how many apples are left. In this way, letting children unconsciously contact and learn mathematics in life can improve their interest in mathematics and help them understand the importance of mathematics in life.
In primary school, we should master the arithmetic of carry addition, subtraction, multiplication and division within 20, multiplication and division within the table, and addition and subtraction within 100, which is the basis of all other operations. For example, when calculating 9+4, because 9+ 1 gets 10, 4 is divided into 1 and 3 (ten-point method), 13 plus 3. To simplify the thinking process, just divide 4 by 1 and add 9 to make it 10, and the rest is a dozen. It is impossible to learn math well without a solid foundation.